What is the impact of the ammonia content in the lean methanol from low-temperature methanol washing on the system, and what are the control methods?
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In low-temperature methanol washing, does the ammonia content in the regenerated lean methanol affect absorption, and what are the reasons for this effect? What are the indicators for regenerated poor methanol? What are the specifications for NH3, H2S, and H2O at each plant? Does the system have an ammonia exhaust design? Ammonia discharge location, how to discharge ammonia? When discussing, please indicate whose process technology is being used!
1. The ammonia content in lean methanol has an impact on absorption; primarily, ammonia reacts with hydrogen sulfide to form ammonium sulfide, which then decomposes in the absorption tower, resulting in excessive levels of hydrogen sulfide in the purified gas. 2. The main components are NH3, H2S, and H2O, with limits of NH3 ≤ 60 mg/l, H2S ≤ 60 mg/l, and H2O ≤ 1%
Additionally, ammonia reacts with carbon dioxide to easily form ammonium carbonate crystals
Generally, in pre-washing and regeneration systems, the ammonia content is measured in the azeotropic tower and the heat regeneration tank reflux stream, and is discharged at the inlet of the reflux pump